There is considerable pressure to define the key requirements of 5G, develop 5G standards, and perform technology trials as quickly as possible.
Normally, these activities are best done in series but there is a desire to complete these tasks in parallel so that commercial deployments of 5G can begin by 2020.

5G will not be an incremental improvement over its predecessors; it aims to be a revolutionary leap forward in terms of data rates, latency, massive connectivity, network reliability, and energy efficiency.